/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Polygroups/PolygroupUtil.h
index of Layer in Mesh AttributeSet, or -1 if not found
namespace UE { namespace Geometry { int32 UE::Geometry::FindPolygroupLayerIndex ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, const [FDynamicMeshPolygroupAttribute](API\Runtime\GeometryCore\DynamicMesh\FDynamicMeshPolygroupAttribute) * Layer ) } }